![]() Selected sequentially, as required, from the following list:Īttachment C of Annex 10, ( 2.6 Deployment of ILS frequencies) provides some details about this selection:Ģ.6.5 In general, when international use of ILS systems is confined to the pairings listed in Chapter 3, 3.1.6.1.1, the criteria are such Landing system do not justify more than 20 pairs, they shall be Localizer and glide path transmitter frequencies of an instrument ![]() Pairing was carefully designed so that ILS could work without interferences ( harmonic and heterodyne) in certain conditions without being below the radio horizon of each other.Ī preferred pairing table is provided for such use:ģ.1.6.1.1 In those regions where the requirements for runway The pairing table was built back in 1956! (Fifth Session of the COM It's ITU which is responsible for the global (civil) use of the frequency spectrum. ICAO decisions in radiocommunication matters are subject to the frequency allotment and protection decisions taken under the auspices of the ITU during the World Radiocommunication Conference (WRC), held every four years. The localizer / glide path pairing table is part of Annex 10 of the Convention, Volume I, paragraph 3.1.6.ģ.1.6.1 The pairing of the runway localizer and glide path transmitterįrequencies of an instrument landing system shall be taken from theįollowing list in accordance with the provisions of Volume V, Chapter For aviation, the international body is ICAO and ICAO Chicago Convention is the main framework used to ensure international aviation operations are possible, safe and fair: However this local decision happens after an agreement already found in international bodies. As always the country is responsible for the final decision, so FAA/FCC will decide in the US (but see 's comment from an insider below), and I believe so does the MIC in Japan. ![]()
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